Liguo Zhang

TL;DR: In this article, the effect of shoulder geometry and pin geometry on material plastic flow behavior is studied, and the results of numerical simulation show that the flow velocity of material decreases with the increase of the distance away from the weldment surface or the rotational axis of pin.

TL;DR: In this paper, the effect of welding speed on mechanical properties of SSFSW joint is investigated in detail, and a defect-free joint with gloss surface and small flash is attained and no cracks appear at the bending angle of 180°.

TL;DR: In this paper, a refill friction stir spot welding (RFSSW) was used to weld 2 mm-thick 5083-O alloy and three fracture modes were obtained during the lap shear test and all were affected by the hook defect.

TL;DR: In this article, the effects of tool rotating speed on joint features and lap shear properties of the lap joints were mainly discussed, where stationary shoulder technology was used to fabricate 6061-T6 friction stir lap welding (FSLW) joints.

TL;DR: From the view of increasing the flow velocity of material near the bottom of the workpiece or in the middle of workpiece, the tool with the half-screw pin and the toolwith the tapered-flute pin are both better than the conventional tool.